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The first such act was the Northwest Ordinance, passed in 1787 by the U.S. Congress of the Confederation (under the Articles of Confederation, predecessor of the United States Constitution). The Northwest Ordinance created the Northwest Territory in the land west of Pennsylvania and northwest of the Ohio River and set the pattern of development that was followed for all subsequent territories. The Northwest Territory covered more than 260,000 square miles and included all of the modern states of Ohio, Indiana, Illinois, Michigan, Wisconsin, and the northeastern part of Minnesota.
The Organic Act for the Territory of New Mexico was part of the Compromise of 1850, passed September 9, 1850. Primarily concerned with slavery, the act organized New Mexico as a territory, with boundaries including the areas now embraced in New Mexico, Arizona, and southern Colorado.
List of Organic Acts
Territorial organic acts have included, in chronological order):
Areas now part of a U.S. state or D.C.:
- The Northwest Ordinance
- The Indiana Territory Organic Act
- The District of Columbia Organic Act of 1801
- The Organic Act of 1804, with respect to the Territory of Orleans
- The Michigan Territory Organic Act (1805)
- The Illinois Territory Organic Act (1809)
- The Organic Act of 1848, created the Territory of Oregon
- The Utah Territory Organic Act
- The New Mexico Territory Organic Act
- The Kansas-Nebraska Act created Kansas Territory and Nebraska Territory
- The Colorado Organic Act, 1861, created the Territory of Colorado out of eastern Utah Territory, western Kansas Territory, southwestern Nebraska Territory, and a small portion of northeastern New Mexico Territory
- The Nevada Territory Organic Act, 1861
- The Dakota Organic Act of 1861
- The Arizona Organic Act, created the Territory of Arizona in 1863 from western New Mexico Territory
- The Montana Organic Act, created the Territory of Montana in 1864
- The District of Columbia Organic Act of 1871, amalgamated Anacostia, Georgetown and Tenley Town to the City of Washington; and consolidated the County of Washington, City of Washington and District of Columbia into one governmental unit
- The First Organic Act for Alaska, 1884
- The Second Organic Act for Alaska, 1912
- The Oklahoma Organic Act of 1889, established the Oklahoma Territory
- The Hawaiian Organic Act, enacted in 1900, established a government for the Territory of Hawaii
Current overseas territories of the United States, known as Insular areas:
- The Foraker Act or Organic Act of 1900, established civilian government in Puerto Rico. It has since been superseded by the Constitution of Puerto Rico.
- The Organic Act of the Virgin Islands of the United States of 1936 (Pub.L. 74–749, 49 Stat. 1807, enacted June 22, 1936) established a government for the U.S. Virgin Islands, replacing previous temporary provisions (Pub.L. 64–389, 39 Stat. 1132, enacted March 3, 1917). It was replaced in 1954.
- The Guam Organic Act of 1950, transferred Guam to the United States Department of the Interior as an unincorporated territory.
- The Revised Organic Act of the Virgin Islands of 1954 repealed and replaced the previous Organic Act of the Virgin Islands.(Pub.L. 83–517, 68 Stat. 497, enacted July 22, 1954)
- The Philippine Organic Act (1902), creation of an elected Philippine Assembly.
- The Jones Law (Philippines), replaced the 1902 act in 1916 and created a fully elected Philippine Legislature.
- The National Park Service Organic Act, establishing the National Park Service and the National Park System in 1916
- The Federal Land Use Policy Act of 1976, the organic act establishing the Bureau of Land Management